AASHTO T 355-19描述了用于测试垂直或倾斜的深基础元件以响应内部施加的轴向静载荷来确定其行为特性的过程。该方法适用于所有与钻孔桩功能相同的深基础，无论其施工和安装方法如何。

This test method describes procedures for testing vertical or inclined deep foundation elements to determine their behavior characteristics in response to an internally applied axial static load. This method is applicable to all deep foundations that function in the same manner as bored piles, regardless of their method of construction and installation.Note—Bidirectional load testing has been successfully performed on driven piles. However, the installation and procedural differences associated with bidirectional load testing of driven piles are not covered in this standard.This standard provides minimum requirements for bidirectional testing for deep foundation elements under controlled application of static axial compressive load.The engineer responsible for the foundation design, referred to herein as the engineer, shall approve any deviations, deletions, or additions to the requirements of this standard.Note—Plans, specifications, or provisions, or some combination thereof, prepared by a qualified engineer, may provide additional requirements and procedures as needed to satisfy the objectives of a particular test program.Note—To determine the long-term performance of the foundation, the duration of each load step application may be extended and the test results may need additional interpretation.A qualified engineer shall design and approve all loading apparatus, loaded members, and test procedures.The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How the results obtained using this standard are applied is beyond the scope of this test standard.This standard was formerly designated as provisional standard TP 100.